Tube cleaning machine



FIG. 1 is a front elevation view of a tube cleaning machine, showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

I claim the ornamental design for a tube cleaning machine, as shown and described. 